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// Test that `dyn ?Sized` (i.e., a trait object with only a maybe buond) is not allowed, when just
// `?Sized` results from trait alias expansion.
#![feature(trait_alias)]
trait S = ?Sized;
// Nest a couple of levels deep:
trait _0 = S;
trait _1 = _0;
// Straight list expansion:
type _T0 = dyn _1;
//~^ ERROR at least one trait is required for an object type [E0224]
// Twice:
trait _2 = _1 + _1;
type _T1 = dyn _2;
//~^ ERROR at least one trait is required for an object type [E0224]
fn main() {}
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